Process of making black and white negatives for photo-engraving and other similar photograhic reproductions.



UNITED STATES PATENT OFFICE;

"- ZACHAIiIAH J. corn, or s'rELLa'ANn-w'xmimn mgn'uw'ro-u, or eizauia'fimi'ssoum.

No Drawing.

Toall whom it may concern:

Be it known that we, ZiioHAnmH JI G01,

and rVlLLIABt M. Xnwrox citizens of the ,United States, and residents, respectively,

of Stella and Granb y, county .of Newto11,

and State of Missouri, have invented and V discovered a new and use'tul Improvement plates from pen drawings, half-tone screens,

; throughtlie dry plate and its film. and will inv the Process of Making Black and White Negativestor Ph tofin raving and other, S milar Photographic Reproduct ons.

. .Tlie objecbof our invention and discovery is to produce. black and white negatives tor photo-engraving, such as halt-tones, line or negatives with great density and clear lines or dots, on extrarapid gelatin dry plates withoutintensitication or (die clearing process or stripping the half'tone negative for reversing or using a mirrorwor prism, as now done by half-tone engraver-s; and in about one third the time consumed by the known processes; and effecting a great saving in the cost over the processes wherein wet portrait plates and slow' dry portrait plates are used in the old way common to photo-engravers. To accomplish this, take an ordinary photographic camera, put the screen slide in place and the glass screen in place inthe usual manner then-take an extra rapid gelatin portrait dry'p'late and place it reversed in the pl'ate-l'iolder, that is with its.

smooth side back of and next to the glass screen'but not in contact, then-take a black paper card boardwit-h rough or unglazed surfaces and place it a 'ainst'the film side of the t X P ate. This absorb anv rays of light that penetrate avoid halation; then close the plate-holder and expose the plate in the usual way for about one or one and a half minutes; then take the plate-holder to'tl1e'darkroom and place the plate in the developing tray and pour ovr adeveloper composed of the followingchemicals in' the following propornon:

No. 1: Distilled water, 5 ozs.; hydrochinon, 2i grs; sulfite of soda crystals, 180 grs; carbonate of potassium, 120 grs; sugar, (preferably granulated), J teaspoonful.

No. 2: Distilled water, 1 oz.; hyposulfite of soda, 48 grs.

Drop 5 dro s of No. 2 into No. 1, if dots are still veile dro in 3 more drops or sufficient to clear the ots in the high lights be- OTHER SIMILAR-PHOTOGRAPHIC REPRODUCTIONS. i i

Specification of Letters Patent. 'P3 tented Sept. '5. Apulication filed march-30,1998. Serial mama.

' tore dpvelopnient ..starts.f v

as fully developed .place' jit in a fiiting t composed of two combuia ions as follows:

black cardboard will.

' No. '1 Distilled .water, 86 splfuric No. 2"gi'adually to .No. 1,. stirring, 'a sadded;

' acid, 2-. d re; sulfite of soda,, oz ci'irome after said plat eis tl lorouglily fixed and drylin 'the usualmanner; a .7

H Heretofore n exposing an extra rapid dry plate fora halftone negative the action of light through the clear po rtions of the screen in the whitea parts tof the picture being .copied, causedfveiling oii ,halation in what should; be clear. spaces," and when sufiicient tin ie in exposure wasgiven for the dots to coalesce the negatives Would'not print on the sensitized metal; if the exposure was shortened the dots would not coalesce and the negative was a failure for this reason. To overcome this halation which is causedby a slight light effect on the bromid of silver of the film, we use a solvent of bromidof silver (which is hyposulfite of soda) in .gthe developer in only sufiicient quantity to clear this defect before development begins and thus make fine half tone negativesf' from extra rapid gelatin dry platesin less than one third the time consumed by the old methods with wet plates or even slpw dry plates madeespecially for engraver s, use; and it is practical under our process-to use even a single landscape lens for .lia'lftone negatives anddo more rapid work than with finer lenses by the old processes and produce splendid halt'tones. The sugar added-gito the developer is'a preservative to make the solution keep, :5:

To more fully describe the improved process in detail -take an ext'ra fast-gegular portrait dry plate suchas is comni'o y used by photographers and place said plate reversed and back of the objectivefir lens and screen in the plateholder, in focubn the copy you wish to half-tone; then place a black paper on the film of said plate and cover it with a card board to make it lie fiat or use a black card board; close the plateholder and place the camera and expose the plate about a minute or a minute and a half with average intensity of light, the'rectilinear lens stopped down to focus 32; then take the plateholder to dark room and place the put a lid over t 20 portrait p '25 120 grs.; sugar,

Correction In Letters Patent No. 1,002,386.

' pour on the developer heretofore specified ut only enough to cover the plate well,

e tray and rock it for about one minute in darkness; you can then leave the tray for ten minutes before uncovering to note progress of development; if not then intense enough recover the tray .for five minutes more or until suflicientl developed;

then place the late in a fixing ath as heretofore specifi after clearing, wash well and ut the n tive in a rack to dry.

W t we claim asnew and desire to secure by Letters Patent is-- 1-. The process of maln'ng black and white negatives for photo-engraving and other similar photographic, reproductions, which consists in applying to an extra fast gelatin ate after exposing it in a camera in e manner specified, a treatment of a developer composed of distilled water, 6 ozsn hydrochinon, 24 grs.; sulfite of soda crysta 180 grs: carbonate of potassium,

(preferably granulated) i teasgoonful; hydrosulfite of soda, 48 grs; com ined in about this proportion then applying an ordina fixing bath treatment composed, of dist ed water, 128 02s.; sulfuric acid, 2 drains; sulfite of soda, 1}

ozs.;. chrome alum, 11 ozs.; hydrosulfite of soda, 2 lbs., combined in about this proportion, all substantially as and for the purpose set forth.

2. The process of making black and white negatives for photo-engraving and other similar photographic reproductions, which consists in applying to an extra fast gelatin portrait dry plate after exposure in a camera in the manner specified, a treatment with a developer composed of distilled water, bydrochinon, sulfite of soda crystals, sugar preferably granulated), hyposulfite of soda, then a plyin an ordinary fixing bath composed o disti ed water, sulfuric acid, sulfite of soda, chrome alum, hyposulfite of soda, all combined and groportioned substantial'ly as specified an for the purpose ZACHARIAH J. GOLD. v WILLIAM M. NEWTON. Witnesses:

J. B. SMITH, J OHN .Enuonson.

"set forth.

It ishereby certified that in Letters Patent No. 1,002,386, granted September 5,

1911, upon the application of Zachariah J Gold, of Stella, and William M. Newton, pf 'Granby, 'Missouri, for an improvement in Processes of Making Black and White Negatives for Photo-Engraving and Other Similar Photographic Reproductions, an error appears in the printed specification requiring correction as follows: Page 2, lines 26 and 31, for the word hydrosulfite read IlWfite, and that the said Letters Patent should be read with this correction therein that the same may con- :form to the record of the case in the Patent Oflice. I

I Signed and sealed this 10th day of October, A. 1)., 1911.

E. B. MOORE, Oommiarimwr of Patents.

put a lid over t 20 portrait p '25 120 grs.; sugar,

Correction In Letters Patent No. 1,002,386.

' pour on the developer heretofore specified ut only enough to cover the plate well,

e tray and rock it for about one minute in darkness; you can then leave the tray for ten minutes before uncovering to note progress of development; if not then intense enough recover the tray .for five minutes more or until suflicientl developed;

then place the late in a fixing ath as heretofore specifi after clearing, wash well and ut the n tive in a rack to dry.

W t we claim asnew and desire to secure by Letters Patent is-- 1-. The process of maln'ng black and white negatives for photo-engraving and other similar photographic, reproductions, which consists in applying to an extra fast gelatin ate after exposing it in a camera in e manner specified, a treatment of a developer composed of distilled water, 6 ozsn hydrochinon, 24 grs.; sulfite of soda crysta 180 grs: carbonate of potassium,

(preferably granulated) i teasgoonful; hydrosulfite of soda, 48 grs; com ined in about this proportion then applying an ordina fixing bath treatment composed, of dist ed water, 128 02s.; sulfuric acid, 2 drains; sulfite of soda, 1}

ozs.;. chrome alum, 11 ozs.; hydrosulfite of soda, 2 lbs., combined in about this proportion, all substantially as and for the purpose set forth.

2. The process of making black and white negatives for photo-engraving and other similar photographic reproductions, which consists in applying to an extra fast gelatin portrait dry plate after exposure in a camera in the manner specified, a treatment with a developer composed of distilled water, bydrochinon, sulfite of soda crystals, sugar preferably granulated), hyposulfite of soda, then a plyin an ordinary fixing bath composed o disti ed water, sulfuric acid, sulfite of soda, chrome alum, hyposulfite of soda, all combined and groportioned substantial'ly as specified an for the purpose ZACHARIAH J. GOLD. v WILLIAM M. NEWTON. Witnesses:

J. B. SMITH, J OHN .Enuonson.

"set forth.

It ishereby certified that in Letters Patent No. 1,002,386, granted September 5,

1911, upon the application of Zachariah J Gold, of Stella, and William M. Newton, pf 'Granby, 'Missouri, for an improvement in Processes of Making Black and White Negatives for Photo-Engraving and Other Similar Photographic Reproductions, an error appears in the printed specification requiring correction as follows: Page 2, lines 26 and 31, for the word hydrosulfite read IlWfite, and that the said Letters Patent should be read with this correction therein that the same may con- :form to the record of the case in the Patent Oflice. I

I Signed and sealed this 10th day of October, A. 1)., 1911.

E. B. MOORE, Oommiarimwr of Patents.

Correction In Letters Patent No. 1,002,386.

It is'hereby certified that in Letters Patent No. 1,002,386, granted September 5, 1911. upon the application of Zachariah J. Gold, of Stella, and William M. Newton, pf 'Granby, Missouri, for an improvement in of Making Black and White Negatives for Photo-Engraving and Other Similar Photographic Reproductions, an

lines 26 and 31, for the word hydrosulfite read Aypoeulfite; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Oflice.

Signed and sealed this 10th day of October, A. 1).; 1911.

[M] E. B. MOORE,

omnm nionar of Patent;- 

